Connecting rod and internal combustion engine

Abstract

A connecting rod ( 10 ) has a pin bearing eye for attaching the connecting rod ( 10 ) to a crankshaft, a connecting rod bearing eye ( 12 ) for attaching the connecting rod ( 10 ) to a piston of a cylinder, and an eccentric adjusting device ( 13 ) for adjusting an effective connecting rod length. The eccentric adjusting device ( 13 ) has eccentric rods ( 15, 16 ) that act on an eccentric lever ( 14 ) of the eccentric adjusting device ( 13 ). The eccentric adjusting device ( 13 ) also has an eccentric ( 36 ) with a bore for receiving a gudgeon pin ( 37 ). Lubricating oil bores ( 38, 39, 40, 41 ) in the connecting rod bearing eye ( 12 ) and in the eccentric ( 36 ) enable a lubricating oil film to be built up between the connecting rod bearing eye ( 12 ) and the eccentric ( 36 ) and also between the eccentric ( 36 ) and the gudgeon pin ( 37 ).

What is claimed is: 
     
       1. A connecting rod comprising a pin bearing eye for attaching the connecting rod to a crankshaft, a connecting rod bearing eye for attaching the connecting rod to a piston of a cylinder, and an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having eccentric rods that act on an eccentric lever of the eccentric adjusting device, and an eccentric with a bore for receiving a gudgeon pin, first and second lubricating oil bores being in the connecting rod bearing eye and first and second lubricating oil bores being in the eccentric, wherein:
 in a first end position of the eccentric, the first lubricating oil bore of the eccentric aligns with the first lubricating oil bore of the connecting rod bearing eye while the second lubricating oil bore of the eccentric does not align with the second lubricating oil bore of the connecting rod bearing eye so that a lubricating oil film can be built up between the connecting rod bearing eye and the eccentric and between the eccentric and the gudgeon pin only via the first lubricating oil bores; and 
 in a second end position of the eccentric, the second lubricating oil bore of the eccentric aligns with the second lubricating oil bore of the connecting rod bearing eye while the first lubricating oil bore of the eccentric does not align with the first lubricating oil bore of the connecting rod bearing eye so that a lubricating oil film can be built up between the connecting rod bearing eye and the eccentric and between the eccentric and the gudgeon pin only via the second lubricating oil bores. 
 
     
     
       2. The connecting rod of  claim 1 , wherein the lubricating oil bores in the connecting rod bearing eye extend in the radial direction of the connecting rod bearing eye and the lubricating oil bores in the eccentric extend in the radial direction of the eccentric. 
     
     
       3. The connecting rod of  claim 1 , wherein the first lubricating oil bore of the eccentric and the first lubricating oil bore of the connecting rod bearing eye have identical diameters. 
     
     
       4. The connecting rod of  claim 1 , wherein the first lubricating oil bore of the connecting rod bearing eye has a greater diameter than the first lubricating oil bore of the eccentric. 
     
     
       5. The connecting rod of  claim 1 , wherein the second lubricating oil bore of the eccentric and the second lubricating oil bore of the connecting rod bearing eye have identical diameters. 
     
     
       6. The connecting rod of  claim 1 , wherein the second lubricating oil bore of the connecting rod bearing eye has a greater diameter than the second lubricating oil bore of the eccentric. 
     
     
       7. An internal combustion engine that has an adjustable compression ratio, the internal combustion engine having at least one cylinder and a crankshaft on which at least one connecting rod acts, the connecting rod having a pin bearing eye for attaching the connecting rod to the crankshaft, a connecting rod bearing eye for attaching the connecting rod to a piston of a cylinder, and an eccentric adjusting device for adjusting an effective connecting rod length, the eccentric adjusting device having an eccentric that interacts with an eccentric lever and eccentric rods that act on the eccentric lever and are loaded by a hydraulic pressure that prevails in hydraulic chambers that interact with the eccentric rods, the connecting rod being configured as claimed in  claim 1 .